Expansion-bolt



H. W. AYLWARD.

EXPANSION BOLT.

' APPLICATION FILED SEPT. 10, 1918.

Patented Aug. 17, 1920.

T g W B S e 8 v S W PATENT OFFICE.

HENRY W. AYLWARD, 0F BROOKLYN, NEW YORK.

EXPANSION -BOLT.

Application filed September 10, 1918.

as masonry or concrete and to be subse-- quently expanded into intimate contact with the walls of such recess by means of pressure applied to one end of the device.

The objects of the invention are to produce a bolt of the above mentioned character which can be cheaply manufactured,

which may be readily inserted in a recess of approximately the same diameter as the bolt, which will make a firm anchorage in the previously drilled recess, by means of which a portion of the bolt will be embedded in a cavity formed by the bolt, and which is capable of ultimate expansion after it is in position.

These and further objects will be more fully pointed out in the following specification and claims and accompanying drawings considered together or separately.

The invention is illustrated in the accompanying drawings in which like parts are designated by similar reference characters and in whic a Figure 1 is a'longitudinal sectional view of the anchor in expanded condition in a structure, the work being shown as support ed upon a supplemental bolt.

ig. 2 is a front view of the anchor.

Fig. 3 is rear end view of the anchor.

Fig. 4: is a longitudinal sectional view one of the anchor members in unexpanded condition.

Fig. 5 is a front end and Fig. 6 is a rear end elevation of the same.

ig. 7 is a view similar to Fig. 6 of the other anchor member.

Fig. 8 is a front end and Fig. 9 is a rear end elevation of the same.

Fig. 10 is a sectional view of a structure showing the anchor expanded in position,

Specification of Letters Patent.

Patented Aug. 17, 1920.

Serial No. 253,388.

the work being shown as supported upon the anchor.

Fig. 11 is a rear fication, and

Fig. 12 is a side elevation of the rear end an anchor showing another modification. In carrying out the invention an anchor 1 comprising two substantially semi-cylindrical members 2 and 3 is employed. Each member 2 and 3 is provided with a semicylindrical head 4: the rear face of which is undercut to form a cutting edge 5. The head portions are of substantially greater diameter than the body portions of the members 2 and 3. a

Each member 2 and 3 is provided with semicylindrical groove 6 extending inward from the headed end and the inner extremity of each groove is tapered, as at 7, toward the inner end thereof.

A portion of the groove 6 in the member 2 including the tapered portion 7 is provided with screw threads 8. If desired the corresponding portions of the groove in the member 3 may be similarly threaded in order that when the members are assembled a continuous thread will extend from the inner end of the cylindrical opening produced by the two grooves toward the open end thereof. Preferably, however, the groove in one member only is threaded. Each of the members has a flat face 9 in order that when such faces are placed to gether a cylindrical structure will be produced.

The inner end of the member 2 on its flat side is provided with a lip 10 having a' face 11 inclined toward the headed end. The inner end of the flat side of the member has a short portion 12 inclined in the same direction as is the face 11.

The heads a may, if desired, be omitted when such portions are not desired. The cutting edge 5 may likewise be dispensed with when the material of the structure is of a highly refractory nature.

In operation a recess 13 is drilled in the structure such as a wall or partition to which the work such as a plate 14 is to be attached. Said recess to be of a diameter approximately equal to the elongated body portion formed of the members 2 and 3 end elevation of a modi- The member 2 is then inserted in the recess until the cutting edge 5, when used,

contacts with the surface of the structure.

The member is now driven, as by the blows of a hammer, until th'e'face of the head is flush with the surface of the structure, the cutting edge eating into the brick or concrete, for example, in forming a socket for the head.

The member 3 is now inserted in the recess with its flat face in engagement with the corresponding face of themember 2. The second member is then driven home, the cutting edge of its head forming a socket for itself. \Vhen the inclined portion 12 comes in to contact with the face 11 of the lip 10 the extremities of both members 2 and 8 will be distorted and spread apart forcing them into intimate contact with walls of the recess and even compressing such material and will by the wedging of the ends of the members firmly secure the anchor in position.

The work is now placed in position with a perforation in line with the cylindrical bore formed by the grooves 6 of the members, and a bolt 15 is inserted in the alined openings. lVhen the threads of thebolt engage the threads'S of the bore it, the bolt,

is screwed home and when its end comes in contact with the tapered portion of the bore, the members 2 and 3 will be spread apart and the anchor forced into more intimate contact with the wall of the recess. Vith a bolt of the length shown in Figs. 1 and 10 the spreading apart of themembers 2 and 3 will be slight, as the bolt engages a short portion of the tapered surface only. If it should develop that the anchor memher 1 has a loose fit in the recess 13 a longer bolt may be inserted and the members be forcedfarther apart and into engagement with the walls of the recess.

. The anchor is firmly and permanently secured in the recess but the work may-be removed at any time.

v If, in the case of heavy work, it is, desired to support the same other than on the relatively small and weak bolt 15, the heads 4 are not driven in flush with the surface, but project enough to enable the work to be placed thereon. The bolt 15 will be placed in position as before and a washer 16 placed between the head of the bolt and the work will retain the latter in position. 'As shown in themodification illustrated in Fig. 11 the members Qrand 3 may be provided with longitudinal ribs or blades 17 which may extend the entire length of the body portions of the membersQ and 3 or for a portion thereof as desired. The ribs 17 will facilitate cutting into the wall of the recess by the expansion of the E I h J a likewise prevent rotation of the anchor in v the recess.

In the modification illustrated inFig. 12 the extremity of the body-portions of the members are provided peripheral ridges 18 which will facilitate cutting into the Wall of the recess and act as additional means for preventing withdrawal of the anchor. Theridges 18 are shown as extending over a part only of the length of the body portion of the anchor but it is obvious they ma extend the entire length thereof.

1 1 1 accordance with the provisions of the Patent Statutes, the principle of the invention. has-been described, together with the apparatus which is now considered to represent the bestembodiment thereof; but it is desired to have it understood that, within the scope of the claims, the apparatus shown is merely illustrative and that the invention may be carried out in other ways.

Having now described the invention what is cl aimedand desired to be secured by Letters Patent is i V 1. A. device of the character described, comprising two members of substantially semi-cylindrical cross section and adapted to be positioned sidesby-side to form a substantially cylindrical structure, and means for distorting a member to produce a noncylind'rical' structure.

2. A device of the'character described,

comprising two members of substantially semi-cylinch'ical cross section and adapted to be. positioned side-by-side to form a substantially cylindrical structure, and means carried by the members for distorting a member to produce a non-cylindrical structure. V V

3. A device of the character described, comprising two members of substantially semi-cylindrical cross section and adapted to be positioned sideeby-side. to form a substantially cylindrical structure, 1 and. means 'for distorting the members .to produce a non-cylindrical structure. g I

' LA device of'the character described, comprising two members .of substantially semi-cylindrical cross section and adapted to be positioned side-by-side to form a sub stantially cylindrical structure, and .means carried by the members for distorting the members to produce anon-cylindrical structure. l

'5. A device of the" character'described comprising two 'members of substantially semi-cylindrical cross section and adapted to be positioned side-by-side'to form a substantially cylindrical structure, and a lip on, one member adapted toibe engaged by the other member whereby the lip carrying member will be distorted-to produce a noncylindrical structure. 1

6. A device of the character described,

comprisingtwo members of substantially semi-cylindrical cross section and'adapted to be positioned side-by-side to form a substantially cylindrical structure, and a lip on one member adapted to be engaged by the other member whereby the other member will be distorted to produce a non-cylindrical structure.

7. A device of the character described, comprising two members of substantially semi-cylindrical cross section and adapted to be positioned side-by-side to form a substantially cylindrical structure, and a lip on one member adapted to be engaged by the other member whereby both members will be distorted to produce a non-cylindrical structure.

A device of the character described, comprising two members of substantially semi-cylindrical cross section and adapted to be positioned side-by-side to form a substantially cylindrical structure, there being a semicylindrical groove in each member whereby a cylindrical socket will be produced when the members are assembled, said grooves being of less length than the members, and a bolt for engaging the socket.

9. A device of the character described, comprising two members of substantially semi-cylindrical cross section and adapted to be positioned side-by-side to form a substantially cylindrical structure, there bein a semi-cylindrical groove in each mem er whereby a cylindrical socket will be produced when the members are assembled, said grooves being tapered and of less length than the members, a thread in the socket, and a threaded bolt for engaging the threads of the socket.

10. A device of the character described comprising two members of substantially cylindrical cross section and adapted to be placed side-by-side to produce a substantially cylindrical structure, a head on each member, each head having a semi-circular cutting edge whereby the structure may be caused to enter a refractory material.

11. A device of the character described comprising two members of substantially cylindrical cross section and adapted to be placed sideby-side to produce a substantially cylindrical structure, a head on each member, each head having a semi-circular cutting edge whereby the structure may be caused to enter a refractory material, and means for distorting the members to intimately engage the refractory material in which the structure is inserted.

12. A device of the character described comprising two members of substantially cylindrical cross section and adapted to be placed side-by-side to produce a substantially cylindrical structure, a head on each member, each head having asemi-circular cutting edge whereby the structure may be caused to enter a refractory material, and means for preventing rotation of the structure.

13. A device of the character described comprising two members of substantially cylindrical cross section and adapted to be placed side-byside to produce a substantially cylindrical structure, a head on each member, each head having a semi-circular cutting edge whereby the structure may be caused to enter a refractory material, and means for distorting the members to intimately engage the refractory material in which the structure is inserted, there being means on the peripheries of the members to resist withdrawal of the structure.

This specification signed and. witnessed this ninth day of September, 1918.

HENRY WV. AYLVVARD.

Witnesses:

J. F. COLEMAN, A. E. BENTON. 

